In the last couple of days, I've been closely interacting with Harald Mueller, the developer behind Android Wi-Fi Tether for root users, a free and open source tethering app for Android. Android Wi-Fi Tether is pretty much a de-facto app when when it comes to tethering on Android devices that have native Wi-Fi tethering disabled (thanks, carriers), and is what I consider one of the most important apps in our supposedly open ecosystem.